Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
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Recycling concrete &building rubble is not only able to bring profit to investors, but also good for environment protection.
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The concrete mix design process considers key performance parameters such as compressive strength, chloride ion penetration resistance, and carbonation resistance. ... However, the porous nature and higher water adsorption of recycled aggregate pose challenges in recycled aggregate concrete (RAC) including a …
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The orthogonal experimental investigation indicated that water-to-binder ratio had the most significant effect on concrete compressive strength, followed by ratio of RCAs to binder, and replacement ratio of RCAs to natural aggregates. The optimized mix design for pervious concrete containing RCAs was identified to achieve highest strength (i.e ...
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The replacement levels of recycled aggregate were 25% and 50%, and equivalent mortar volume mix design was applied for recycled aggregate concrete. The results show that the mechanical …
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The manufacturing of recycled aggregate geopolymer concrete is one of the cost-effective ways to dispose vast amounts of debris. The use of recycled aggregate geopolymer concrete as structural concrete is not encouraged due to lack of appropriate mix design methodology. The current study aims to develop a new mix design …
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Compressive and splitting tensile strength tests on recycled concrete with CRCA ( substituting limestone aggregate) made from two mixed SC with varying strengths, have been implemented to ...
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Table 1 displays the mix design of both natural sand mortar and recycled concrete aggregate mortars. We followed standard ASTM C 305 for the casting procedure. After casting, the specimens were poured into prismatic molds, covered with plastic film, and left to cure for 24 h under vibration.
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This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. ... E., & Gomart, H. (2014). Mix design and properties of recycled aggregate concretes: Applicability of Eurocode 2. International Journal of Concrete Structures and Materials, …
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This paper puts forward a strength-based mix design method for recycled aggregate concrete using a modified empirical formula. A total of 30 mixes, the amount of cement varies from 300 kg/m³ to ...
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The RCA-concrete mixes were proportioned using a new concrete mix design method, termed the equivalent mortar volume (EMV) method. The EMV method is based on the hypothesis that RCA is a composite material comprising mortar and natural aggregate; therefore, when proportioning a concrete mixture containing RCA, one must …
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Steel fiber reinforced recycled coarse aggregate concrete (SFRCAC) is an impact minimisation building material. Mixture proportion design method of SFRCAC is developed in this paper to obtain concrete with target strength and workability, which can be used in structural members. Four key parameters of mixture proportioning, steel fiber …
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4.2.1 Review Points. The basic idea of NAC mix proportion design in China [] is that the concrete mix proportion design depends on three parts: the w/c ratio, water amount, and sand- aggregate ratio.According to the preparation of the concrete strength and the actual strength of cement, the w/c ratio is obtained by calculations using the …
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First, the waste concrete is broken into demolished concrete lumps with a characteristic size of 60–300 mm to partially replace fresh concrete to form recycled lump concrete [13], [14], [15]. Alternatively, waste concrete can be crushed into recycled aggregate to partially or fully replace natural aggregate to produce recycled aggregate ...
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DOI: 10.1016/j.istruc.2024.106598 Corpus ID: 269959125; Review on high-strength recycled aggregate concrete: Mix design, properties, models and structural behaviour @article{Liu2024ReviewOH, title={Review on high-strength recycled aggregate concrete: Mix design, properties, models and structural behaviour}, author={Zhihui Liu and Yan …
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The manufacturing of concrete with fine fraction of RCA and/or recycled mixed aggregates (RMA) (from a mix of concrete, asphalt, masonry, etc.) has not been studied in depth.
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The mix proportion was the same for the two sizes of aggregates. While the control mixtures contained of crushed limestone coarse aggregates, referred throughout the paper as NCA, serving as reference mixtures. ... Influence of the amount of recycled coarse aggregate in concrete design and durability properties. Construction …
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The reuse of recycled aggregates in the composition of concrete is a major challenge today in response to the high cost of construction and the environmental impact of waste This work evaluates ...
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The reason for recycling is the reduction of waste in order to protect nature against pollution, the increasing shortage of suitable dumping grounds, and to save energy and natural resources. Concrete debris is typically reclaimed as recycled aggregate (RCA). By recycling concrete, valuable landfill space and natural resources are …
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The results show that the proposed mix design method can mix different stable strength grades of RAC promptly and efficiently, and the steel tube and GFRP tube can provide a well confining effect on core RAC to improve the mechanical behavior of column. For the environment protection and sustainable development in building construction, waste …
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The undesirable properties of conventional recycled fine aggregate (RFA) often limit its application in the construction industry. To overcome this challenge, a method for preparing completely recycled fine aggregate (CRFA), which crushes all concrete waste only into fine aggregate, was proposed. The obtained CRFA had high apparent …
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This paper. is devoted to the studies of material and mechanical properties of recycled aggregate concrete using. packing density method. This paper considers mix of two different aggregate …
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The environmental impact of three types of concrete products ( aggregate concrete, recycled aggregate concrete, and CO 2 Concrete) using the same mix design but different ratios of cement and aggregate and with and without chemical additives, were assessed by the CML 2001 (baseline) method. Two functional units, one …
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This paper prepared recycled aggregate pervious concrete by replacing natural aggregate with volume of waste concrete. We carried out experiments to study the influences of strength grade and ...
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2. The Simple Mix Design Method of Recycled Aggregate Concrete. The simple mix design method, including the orthogonal test method and the single-factor test method, were combined to determine the mix proportion of RAC in this section. The former was firstly applied to find the main factors.
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For the environment protection and sustainable development in building construction, waste concrete can be processed into recycled aggregate to mix the recycled aggregate concrete (RAC). However, the existing mix design methods of RAC were complex, and the mechanical properties of RAC were more weakened than …
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The use of recycled aggregate geopolymer concrete as structural concrete is not encouraged due to lack of appropriate mix design methodology. The current study aims to develop a new mix design methodology by using fly ash and ground granulated blast furnace slag with recycle aggregate, which is simpler and more consistent …
DetailsHowever, using a recycled aggregate of more than 65% can impact the mix's durability significantly, reducing its physical properties tenfold. The optimum amount blended in with the concrete should be 35%. Some experiments have shown that the recycled aggregate is durable, no doubt, but not as sturdy as natural coarse aggregate.
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Notable examples include studies on: recycled concrete aggregate properties with amounts of old adhered mortars (Duan and Poon Citation 2014), ... Furthermore, considering the appropriate mix design and binder materials when using RCA can enhance the overall density of the concrete mixture.
DetailsThe effects of the UFS and NS mineral admixtures produced greater performance improvements in the concrete than the recycled coarse aggregate. Finally, the optimal mix proportion was determined. For this mix, the thermal conductivity coefficient and compressive strength of the concrete were 0·305 W/(m.K) and 46·7 MPa respectively.
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This article is on the development of a mix design method for self-compacting recycled aggregate concrete (SCRAC) by considering the adhered mortar content (AMC) on the surface of the aggregate.
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Sustainable mix design of recycled aggregate concrete using artificial intelligence. February 2024. Journal of Cleaner Production. DOI: 10.1016/j.jclepro.2024.140994. License.
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Zhang et al. [22] applied RSM to the design of a recycled aggregate permeable concrete mix and found a suitable combination of aggregate gradation and admixture mix. Natalia et al. [23] used the ...
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The high porosity of recycled coarse aggregate, which results in recycled aggregate concrete (RAC) more vulnerable to freeze–thaw (FT) damage and chemical attack, is a dominant factor that ...
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The result shows that the developed mix design uses lesser quantities of cement and fine aggregates. Replacement of about 30% river sand (RS) by RFA was found optimum. ... S., S. Kumar, and S. V. Barai. 2017. "Recycled aggregate concrete: particle packing method (PPM) of mix design approach." Constr. Build. Mater. 152 …
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RSM can be used to design the mix proportion of recycled aggregate pervious concrete. • Experiments on the paste based on BBD show that IPT and ACT are significantly affected by the dose combination of three admixtures (SP, VMA, and RE). The most significant factor affecting IPT is VMA 2, while the linear term SP has strongest …
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One such solution is the development of geopolymer binder with recycled aggregate concrete, which can reduce the consumption of ordinary Portland cement and natural aggregates. ... Mix design development of fly ash and ground granulated blast furnace slag based geopolymer concrete. J. Build. Eng., 20 (2018), pp. 712-722, …
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